eChapters

Secondary nutrients

Secondary nutrients includes Calcium, magnesium, and sulfur. Crop plants requires secondary nutrients in moderate quantity for crop growth and yield. Their requirement by plant is less than the macro nutrients. Sulphur and Magnesium requirement of crops are very similar to the Phosphorus needs. Calcium is required in higher amount than Phosphorus. Calcium and magnesium are mostly deficient in acid and alkali soils. In India S deficiencies are found in almost 40 per cent of the cultivated soil. Under intensive cropping system, the use of higher amount of nitrogenous fertilizer without secondary and micro nutrients and lesser use of organic manures are the major reason for the secondary and micro nutrient deficiency in soil.

It is generally observed that N, P and Zn content in soil decreases with increasing soil salinity. Nutrient imbalances created by continuous use of chemical fertilizers, particularly nitrogenous fertilizer alone, combined with sub optimal rates of other nutrients or total omission of other nutrients are the primary causes for unsustainable yields of crops in saline soil. A sustainable approach for nutrient management in salt affected soils should therefore include balanced use of organic, inorganic and biological sources of nutrients (Bandyopadhyay and Rao, 2001). Organic amendments are known to facilitate the reclamation of sodic soils and better nutrition of crops (Anand swarup, 1992).

Experiments at Central Soil Salinity Research Institute (CSSRI), Kamal, India showed that alkali soils are not always high in available P and rice and wheat significantly responded to addition of P (Pathak et al., 1975).

The availability of phosphorus in soil either native or added is limited by fixation and precipitation mechanisms. The organic acids released during decomposition of organic matter influences the soil pH, form stable complexes with cations responsible for P fixation and thus increases the availability (Tiwari et al., 1980).

The use of bulky organic manures (Maurya and Ghosh, 1972; Chaudhary et al., 1981) and green manures (Prabhakar et al., 1972; Sharma et al., 2000) has been found very beneficial for P management of saline and alkali soils as these improve the soil physical condition and the availability of soil phosphates.

Potassium availability in most of the coastal salt affected soils of India is rich except when the soils are low in clay content (Bandyopadhyay et al., 1985). Plants grown under high salinity may show K deficiency due to the antagonistic effect of Na on K absorption and / or disturbed Na / K ratio. Under such conditions application of K is also known to reduce the adverse effect of salinity and sodicity on crop growth (Qadar, 1995). Singh et al. (1980) reported that the addition of FYM increased the K concentration in the soil. Swarup (1987) reported that the incorporation of green manure increased the available N, P and K status of the soil. Available P and K remarkably increased to a tune of 30 and 44 per cent respectively by the application of coir waste (Santhi et al., 1991).

The uptake of Mg by rice plant was highest when fertilizer was applied in combination with vermicompost (Jadhav etal, 1997). Pattanayak etal. (2001) also reported the highest Ca uptake in the treatments that received green manuring of dhaincha. Sriramachandrasekharan (2001) who reported the highest Fe uptake of rice with green manuring of Sesbania aculeata.

Debele et al. (2001) reported that the application of FYM enriched with 10% rock phosphate + gypsum with PSB and PSF @ 500 g inoculums t^-1 of FYM increased the nutrient uptake of maize. The higher nutrient uptake of 227 kg N ha^-1, 59.5 kg P ha^-1 and 227 kg K ha^-1 recorded with the application of enriched FYM @ 2 t ha^-1.

Introduction

Several hazardous chemicals, microbes, and techniques like recombinant DNA technology are used for research and development work in research Institutes and universities. Therefore, the researchers, technical, helping and supporting staffs as well as the laboratory outputs must be kept free from contaminations. Thus, biosafety is necessary to prevent unintentional exposure/ release of hazardous chemicals, microbes/pathogens, and toxins to the laboratory staff and environment. Following the biosafety guidelines and ethical considerations are essential to maintain safety standards for the researchers as well as the environment. This chapter deals with various biosafety measures and ethical issues to be strictly followed while working in a research laboratory. The required safety level needs to be determined as per the chemical/biological materials are used in the laboratory to keep the researcher/environment safe for sustainable research and developmental activities.

Biosafety

The term biosafety is used to describe the procedure and policies needed to ensure environmental and personal safety. Biosafety refers to the containment principles, technologies and practices that are implemented to prevent unintentional exposure to pathogens, toxins, or their accidental release into the environment. A fundamental objective of any biosafety program is the containment of potentially harmful chemical/biological agents as precautionary safety measures.

Why Biosafety?

With the increasing number of countries adopting molecular biology tools and techniques in life science research and development activities, especially in the areas of agriculture and medicine, the biosafety issues are gaining importance to ensure biological safety for the public and the environment. Conducting research in safe and sustainable manner is not only a personal requirement but essential collective efforts to ensure biological safety for a clean and safe environment. This requires rules, regulations, monitoring bodies, and awareness among the workers as well as the public. Therefore, biosafety per se is an integral part of laboratory research and requires awareness among the researchers so that biological safety can be well taken care from the grassroot level.

Detecting pathogens in fish is a vital component of maintaining health in aquaculture systems, as it enables the early identification of diseases and supports swift, effective responses. Fish can be affected by a variety of pathogens, including viruses, bacteria, fungi, and parasites. To ensure that pathogen detection is both reliable and safe, it is critical to implement stringent biosafety measures and adhere to Good Laboratory Practices (GLP). These frameworks are designed to safeguard personnel, protect the surrounding environment, and produce dependable, repeatable diagnostic outcomes.
Good Laboratory Practices represent a set of globally accepted guidelines that promote the generation of consistent and trustworthy data. These practices are fundamental across various applications, from academic research to industrial diagnostics and regulatory processes. Biosafety, in the context of detecting fish pathogens, involves strategies to prevent accidental exposure to infectious agents. Laboratories conducting such work must operate at biosafety levels appropriate to the organisms being examined—typically BSL-1 or BSL-2, with BSL-3 reserved for highly virulent pathogens.
A key element of biosafety is the preliminary assessment of risk. Before starting any diagnostic or research activities, lab personnel must evaluate the nature of the pathogen, its transmission method, level of pathogenicity, and required containment procedures. This evaluation informs the use of protective measures, including gloves, lab coats, eye protection, and in specific cases, respiratory masks. The physical design of laboratories also contributes to biosafety. Proper infrastructure should include accessible handwashing stations, efficient ventilation systems, biosafety cabinets (Class II or above), and controlled entry to reduce the risk of exposure and contamination. Activities that may generate aerosols—such as homogenizing tissues or centrifuging samples—must be carried out within biosafety cabinets to maintain safety.

The purpose of managing a fishery is to maintain the resource so that it is renewable and therefore sustainable. Responsible aquaculture practices rely on sustainable production systems, to minimize impacts on the natural environment, and support resource conservation. In other words, the harvest of fish from the wild or their domestic culture, if performed with sound foundations of ecological and economic principles, can be sustainable and self-reliant commercial industry. In traditional subsistence fisheries, fishermen use primitive and inefficient gear to capture most ornamental fish. However, the supply of aquarium fish is not inexhaustible, and signs of over-fishing are becoming apparent in localized areas. With high demand and pricing of many beautiful species, ornamental fish are being harvested at greater volumes and higher rates, threatening the viability or sustainability of the fishery. Most endemic and sensitive species are restricted to very narrow specific habitats. Their survival, affected by physical over-exploitation for the aquarium trade, may be further hit by habitat alteration. No comprehensive studies have been carried out on the requirements of these endemic or sensitive exported species. In the absence of suitable impact studies, it is not possible to predict the impact of habitat alteration on these species. Exporters target more colorful varieties and since their ecological significance has not been studied, what long-term effect such selective exploitation will have on genetic diversity cannot yet be defined.

Apart from legislation that can be effectively implemented, eco-physiological and population studies of a quantitative nature are urgently needed to advise on the collection, maintenance and transport conditions that need to be followed by exporters to safeguard collected stocks from unnecessary mortality. Exporters are eager to learn and would be receptive to receiving appropriate, scientifically formulated, well-meaning practical advice. Studies should be targeted towards this end since it seems unlikely that the export trade can at present be voluntarily modulated on the basis of conservation requirements. Such a strategy could only become feasible after an adequately robust ecological database has been compiled, which would necessarily require time.

An effective management strategy needs to address not only aquarium-trade related matters but also policy and other matters in an integrated approach if we are to be hopeful of sustaining the ornamental fish industry in the long-term.

Words like rDNA (recombinant DNA) technology, cloning, genetically modified organism (GMO), living modified organism (LMO) and transgenics are of today’s common knowledge. However rather than scientific interest, debates on biosafety issues have made these terms more agnized among general people. Global, sectorial and individual protests against transgenic plants and animals are enunciated allover the world raising issues and concerns over risks and health hazards of using these organisms. Despite these protests and concerns, commercial use of transgenic organism as food, feed or other purposes are increasing at an exponential rate. Although there is not much scientific evidence where transgenics have caused havocs on ecological balance or human health, the biosafety issues need to be solved to provide a safer environment rather than be sorry and lament in the future for today’s mistakes. One of the major problems in supporting use of GMOs lies in the incapability of biosafety science to draw reliable and widely acceptable conclusions for labeling a safe tag on these organisms and their derivatives.

• General considerations

 • Biosafety levels-1 and -2

 • Biosafety level-3

 • Biosafety level-4

General Considerations

Biosafety is a combination of laboratory practices, techniques, equipments and other facilities appropriate for the protection of hazards posed by infectious agents handled in the laboratory. There are guidelines for maintaining the biosafety in laboratory at various levels described as under:

Precautions to be taken while working in the laboratory for personal safety and to prevent any hazards.
    1.    Be vaccinated against dangerous viruses viz., rabies and hepatitis B as persons can contract infection while working with these organisms.
    2.    Use eye protection viz., goggles, spectacles etc to avoid splashing microbes into the eyes. 
    3.    Do not rub eyes with contaminated hands or objects.
    4.    Do not eat or drink anything in the microbiology laboratory as it will contaminate the laboratory.

Introduction
 
Nanotoxicity is a serious concern to be addressed sooner than later as nano-based processes and products in various fields are being extensively exploited. Nanotoxicology is the science of engineered nanodevices and nanostructures that deals with their effects in living organisms (Oberdorster et al., 2005). The unique property of nanoparticles is in its very large surface area to mass ratio, which is considered to be a boon to create novel products. But this distinctive property also challenges the way we identify, understand and address potential risks caused by nanoparticles (Rajkishore et al., 2011). It is sufficient to alert us to the fact that some engineered nanoparticles do indeed behave differently to their more conventional counterparts and may present new and unusual risks. Kahru and Dubourguier (2010) assessed the existing literature on nanotoxicity to main food chain levels (bacteria, algae, crustaceans, ciliates, fish, yeasts and nematodes) and classified the NPs of Ag and ZnO as “extremely toxic”, C60 fullerenes and CuO NP as “very toxic”, SWCNTs and MWCNTs as “toxic” and TiO₂ NP as “harmful”. 

9.1 The Cartagena Protocol on Biosafety: Objectives and Implementation
9.1.1 Introduction
The Cartagena Protocol on Biosafety (CPB) is a pivotal international legal instrument under the Convention on Biological Diversity (CBD), dedicated to regulating the transboundary movement, handling, and use of living modified organisms (LMOs) derived through modern biotechnology that may adversely affect biological diversity, human health, or the environment. Adopted in January 2000 in Cartagena, Colombia, and entering into force on September 11, 2003, the Protocol represents a global consensus on biosafety governance amidst the rapid expansion of genetic engineering technologies.
9.1.2 Objectives of the Cartagena Protocol
The principal objective of the Cartagena Protocol is:
“To contribute to ensuring an adequate level of protection in the field of the safe transfer, handling and use of living modified organisms resulting from modern biotechnology that may have adverse effects on the conservation and sustainable use of biological diversity, taking also into account risks to human health, and specifically focusing on transboundary movements.” (Article 1, CPB)
The core objectives can be summarised as
• Ensuring biosafety in the context of international trade of LMOs.
• Protecting biodiversity from potential risks posed by LMOs.
• Safeguarding human health against unintended exposure to transgenic organisms.

Biotechnology has the potential to revolutionize many aspects in our lives, from healthcare to agriculture. However, along with its benefits, it also poses significant risks to human health, environment, and ecology. Therefore, it is essential to establish biosafety regulations and risk assessment frameworks to promote safe and responsible use of biotechnology. This chapter compiled an overview of biotechnology, the importance of biosafety regulations and risk assessment, IPR protection, contaminants, risk analysis, risk management in laboratories and fields, biosafety concerns to human health, environment and ecology, biosafety at international and national levels, bioethics, and general principles.

Overview of Biotechnology and its Potential Benefits and Risks

Biotechnology refers to the use of living organisms or their components to develop products and processes for various fields such as healthcare, agriculture, and environmental remediation. Biotechnology applications include genetic engineering, bioremediation, biopharmaceuticals, and biobased products.

8.1 Steps in Biosafety Risk Assessment
8.1.1 Introduction
Biosafety Risk Assessment is a systematic, science-based process used to identify, evaluate, and mitigate risks associated with handling biological agents, genetically modified organisms (GMOs), and biotechnological products. It is central to ensuring human safety, environmental integrity, and regulatory compliance in both laboratory and field applications.
A well-conducted biosafety risk assessment enables institutions to establish appropriate biosafety levels, implement containment measures, and ensure sustainable and responsible use of biotechnological advancements.
8.1.2 Key Objectives of Biosafety Risk Assessment
• Prevent exposure of personnel to biohazards.
• Avoid environmental contamination and unintended gene flow.
• Determine containment requirements for biological agents.
• Guide institutional and national biosafety decision-making.
• Support regulatory frameworks and compliance obligations.

13.1 Biosafety

Biosafety is the prevention of large-scale loss of biological integrity, focusing both on ecology and human health. These prevention mechanisms include conduction of regular reviews of the biosafety in laboratory settings, as well as strict guidelines to follow. Biosafety is used to protect from harmful incidents. Many laboratories handling biohazards employ an ongoing risk management assessment and enforcement process for biosafety. Failures to follow such protocols can lead to increased risk of exposure to biohazards or pathogens. Human error and poor technique contribute to unnecessary exposure and compromise the best safeguards set into place for protection. The international Cartagena Protocol on Biosafety deals primarily with the agricultural definition but many advocacy groups seek to expand it to include post-genetic threats: new molecules, artificial life forms, and even robots which may compete directly in the natural food chain.

Introduction

Biosecurity includes a set of standard scientific measures, adopted to exclude pathogens from culture environments and hosts and, more broadly, limit the establishment and spread of pathogens” (Mohan et al., 2003; Moss et al., 2012). Biosecurity is an emerging concept, and the phrase is changing as usage differs across nations and among different professional groups. A holistic approach to addressing biological risks associated with food and agriculture is what is widely referred to as "biosecurity.

Biosecurity means protection against infectious biological agents. These agents include bacteria, viruses, protozoa, fungi, parasites, and any other agents capable of introducing infectious diseases into a poultry flock. Biosecurity therefore means maintaining a flock, poultry house or premises in such a way that infectious agents do not have a chance to enter to cause diseases. The biosecurity may be categorized into three: Conceptual biosecurity, Structural biosecurity and operational Biosecurity.

Importance of Biosecurity

In modern poultry production, birds are reared under intensive system where large numbers are concentrated in small area. As a result, when an infectious agent enters a poultry house, there is probability for widespread dissemination if it is not contained. Besides, the broiler and egg industry of today is under increasing consumer and regulatory pressures to guarantee food safety and meet export requirements. As a result, broiler and layer operations around the world require the supply of breeding stock free of salmonellas specific to avian species (such as S. pullorum and S. gallinarum) and those that could cause outbreaks of human food-borne illness. Inadequate biosecurity can contribute to wide epidemics of highly pathogenic or exotic diseases. An infection by a virulent organism within a facility can be devastating, reducing without overt signs of disease. Once contaminated with pathogens, poultry facilities are extremely difficult and expensive to clean, sanitize and disinfect. Prevention of disease is always less expensive than treatment. The cost of implementing biosecurity system is smaller when compared to financial profit that can be made from production. Good biosecurity is therefore vital requirement in the best possible control of disease.

Abstract

The use of biosensors is growing in the food industry as a means to ensure food safety and quality because of its versatility in determining biological compounds. It is defined as analytical technique used for detection of analyte that combines a biological component with a physico-chemical detector. The most important contribution of biosensors in the food sectors is to control production processes and ensure food quality and safety by reliable, fast and cost effective procedures. Biosensors have been useful for the evaluation of food composition, particularly in functional food products fortified with phytochemicals, vitamins and minerals.. Biosensors are replacing conventional analytical tools since they offer advantages in size, cost, specificity, rapid response, precision and sensitivity. Future progress in the biosensor technology involves the development of nutraceutical release technology within packaging material where it can be used to trigger the controllable release of bioactive components and targeted delivery of protective agents into the food product. The growing consumer demands for safe and quality food has led the food industries to search for quick and reliable methods for which the applications of the biosensor technique in the field of food processing and quality control are found to be promising.

Introduction

Biosensor technology is a powerful alternative to conventional analytical techniques, harnessing the specificity and sensitivity of biological systems in small, low cost devices. Despite the promising biosensors developed in research laboratories, there are not many reports of applications in agricultural monitoring. The authors review biosensor technology and discuss the different bio-receptor systems and methods of transduction. The difference between a biosensor and a truly integrated biosensor system are defined and the main reasons for the slow technology transfer of biosensors to the market place are reported. Biosensor research and development has been directed mainly towards health care, environmental applications and the food industry. The most commercially important application is the hand-held glucose meter used by diabetics. The agricultural / veterinary testing market has seen a number of diagnostic tests but no true biosensor systems have made an impact.